Improvement in windmills



G. DES BBO U GH.

W i nd-Mill.

Patented June 8,1875.

luvmom WITNESSES ATTDBNEYS.

THE GRAPHIC C(LPNUTO -LITH.39B=4! PARK PlAOLNX.

UNITED 'rEs GEORGE DESBROUGH, OF UTIOA, NEW YORK, ASSIGNOR TO ALEXANDERH. OHAPIN, OF SAME PLACE.

IMPROVEMENT IN WINDIMILLSL Specification forming part of Letters PatentNo. 164,271, dated June 8, 1875 application filed May 14, 1874.

To all whom it may concern:

Be it known that I, GEORGE DESBROUGH, of Utioa, in the county of Oneidaand State of New York, have invented a newand Improved Windmill 5 and Ido hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawing, forming a part of this specification, in which- Figure l isaside elevation of the machine, and Fig. 2 a horizontal section on theline a; a: of Fig. 1.

My invention is an improvement in the class of windmills in which thewheel is arranged in the center of a fixed frame, and the access of thewind or blast thereto is controlled by slides or gates. The improvementrelates to the arrangement of an annular rack or toothed ring, adaptedto reciprocate circularly, and flanged friction-rollers for supportingand guiding the same; also slotted gates, which are pivoted to said rackor ring and partake of its movement, so as to be simultaneously openedor closed, in the manner hereinafter described.

In the drawing, A indicates the rectangular frame of the machine, and Bthe vertical wheel mounted on a vertical shaft, a. The wheel may be ofany desired and suitable construction. The wind is guided, and,-as itwere, concentrated, upon the wheel by pyramidal side passages G, (towhich I make no claim.) The openings in the wheelcase between thevertical partitions D are provided with the sliding gates E, which aresupported and guided at their outer ends by parallel rods 0, attached tothe partitions D. They are pivoted to and supported by the annular rackG at their inner ends, and slotted thereat, lengthwise, along theirmiddle, to accommodate said rack when it is moved to open or close them.

The dotted lines, Fig. 2, represent the gates closed and the rackprojecting through the slots. The rack is supported and guided bydouble-flanged friction-rollers H, which are pivoted on studs orjournals fixed in the wheel-case. The rack is reciprocated circularly bya pinion, I, meshing therewith, as shown, and mounted on a verticalshaft, K, provided with hand-wheel L. By turning said hand-wheel in onedirection or the other the pinion I will cause the rack G to slide overthe rollers H, carrying the gates with it, and thus opening or closingthem, as the case may be.

Owing to the circular form of the rack-bar, the gates do not move instraight lines, but their inner ends necessarily move a little outwardand then inward relatively to the wheel B. This movement is facilitatedby the free attachment of their outer ends to the guiderods 6 e.

The extent to which the gates are opened of course determines thefreedom of access of the blast to the wheel, and, correspondingly, therapidity of revolution of the latter. When moved inward till their innerends abut the partitions D, as shown in Fig. 2, the openings in thewheel-case are completely closed, and the revolution of the wheel isimpossible.

The arrangement and connection of the rack and slotted gates is such asto admit of their operation with the least possible friction.

I do not claim the combination of a rack and pinion and sliding gatewith a wheel for opening or closing ports in the case thereof but Iclaim- The slotted gates, supported at their outer ends on rods 6, thecircular reciprocating rack G, the flanged friction-rollers H, thepinion I, and shaft K, in combination with the partitions D, arrangedwith relation to the wheel B, as shown and'described.

Utica, New York, April 28, 1874.

GEORGE DESBROUGH.

Witnesses:

ABEL B. BUELL, ALEX. H. OHAPIN.

